SSM之MyBatis(四)

3.7 Mybatis基本原理

3.8 Mybatis的dao层开发使用

3.8.1 传统开发方式

1. 编写usermapper

   public interface UserMapper{
       publice List<User> findAll() throws Exception
   }
   ​
   

2. UserMapper实现

   publice class UserMapperIml implements UserMapper{
       @override
       publice List<User> findAll throws Exception{
           InputStream is = Resource.getResourceAsstream("SqlMapConfig.xml");
           
           SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
           
           SqlSession sqlSession = sqlsessionFactory.openSession();
           
           List<User> list = sqlSession.selectList(UserMapper.findAll);
           
           sqlSession.close();
           
           return list;
       }
   }
   

3. 编写UserMapper.xml

       <select id="findA11" resultType="com.study.domain.User">
           select * from user
       </select>